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Engine-Codes – GMC – B399B GMC

B399B GMC Code - Rearview Camera Supply Circuit

Quick Answer

The B399B diagnostic trouble code for GMC vehicles refers to an issue with the rearview camera supply circuit. Common causes include Faulty rearview camera module, Wiring issues such as frayed or damaged wires in the supply circuit, Loose or corroded electrical connections. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B399B GMC indicates Rearview Camera Supply Circuit.
Common causes
Common causes include Faulty rearview camera module, Wiring issues such as frayed or damaged wires in the supply circuit, Loose or corroded electrical connections.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code B399B GMC Description

The B399B diagnostic trouble code for GMC vehicles refers to an issue with the rearview camera supply circuit. This code indicates a problem with the power supply or wiring that is responsible for the functionality of the rearview camera system. The rearview camera is a crucial component for modern vehicles, providing drivers with enhanced visibility and safety while reversing or parking. When this circuit malfunctions, it can lead to the rearview camera not working properly or not working at all.

OBDII Code B399B GMC - Rearview Camera Supply Circuit
B399B GMC Code - Rearview Camera Supply Circuit

Common Causes of B399B GMC

  1. Faulty rearview camera module.
  2. Wiring issues such as frayed or damaged wires in the supply circuit.
  3. Loose or corroded electrical connections.
  4. Blown fuse related to the rearview camera system.
  5. Malfunctioning power supply to the rearview camera.

Symptoms of B399B GMC

  1. Rearview camera not displaying on the dashboard screen.
  2. Distorted or fuzzy image on the rearview camera display.
  3. Rearview camera image flickering or cutting in and out.
  4. Rearview camera system not engaging when the vehicle is shifted into reverse.
  5. Error message on the dashboard related to the rearview camera system.

How to Fix B399B GMC

  1. Begin by visually inspecting the wiring and connections related to the rearview camera system. Look for any signs of damage, wear, or corrosion. Repair or replace any damaged components.
  2. Check the fuse box for any blown fuses related to the rearview camera system. Replace any blown fuses with ones of the correct amperage.
  3. Test the power supply to the rearview camera using a multimeter to ensure that it is providing the correct voltage. Repair or replace the power supply if necessary.
  4. If the above steps do not resolve the issue, the rearview camera module itself may be faulty and need to be replaced. This may involve removing interior trim panels to access the camera module.
  5. Once the repairs have been completed, test the rearview camera system to ensure that it is functioning properly.

Cost to Fix B399B GMC

The cost of repairing the rearview camera supply circuit can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of parts for this repair could range from $50 to $200, with labor costs adding an additional $100 to $300. Overall, you could expect to pay between $150 to $500 for this repair. Keep in mind that these are rough estimates and actual costs may vary. It is recommended to obtain quotes from local auto repair shops to get a more accurate cost estimate.

What does this mean?

Tech Notes for B399B GMC

B399B 01 Rearview Camera Supply Circuit Short to Battery
B399B 02 Rearview Camera Supply Circuit Short to Ground

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B399B GMC Code

1. What are common symptoms of OBDII code B399B GMC (Rearview Camera Supply Circuit)?

- Common symptoms include a malfunctioning rearview camera, a blank or distorted display, and a warning message on the dashboard related to the rear camera system.

2. What causes the OBDII code B399B GMC (Rearview Camera Supply Circuit) to trigger?

- The code can be triggered by issues such as a faulty rearview camera, damaged wiring or connectors in the camera circuit, or a malfunction in the camera power supply.

3. How can I diagnose the OBDII code B399B GMC related to the rearview camera supply circuit?

- Diagnose the code by visually inspecting the rearview camera and its wiring, checking for loose or damaged connections, and using a diagnostic scanner to gather more information about the issue.

4. What are some repair tips for fixing the OBDII code B399B GMC (Rearview Camera Supply Circuit)?

- Repair tips may include repairing or replacing damaged wiring, connectors, or the rearview camera itself, resetting the camera system, and clearing the trouble codes with a diagnostic tool.

5. Can a DIY enthusiast fix the OBDII code B399B GMC (Rearview Camera Supply Circuit)?

- While some basic inspections and repairs can be done by DIY enthusiasts, complex issues with the rearview camera system may require professional diagnosis and repair to ensure proper functioning.

6. Is it safe to drive with the OBDII code B399B GMC (Rearview Camera Supply Circuit) unresolved?

- It is generally safe to drive with this code, but be aware that the rearview camera system may not function properly, leading to reduced visibility while reversing or parking.

7. How much does it cost to repair the OBDII code B399B GMC (Rearview Camera Supply Circuit)?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve expenses for parts replacement, labor, and diagnostic services from a qualified mechanic.

8. Can weather conditions affect the triggering of OBDII code B399B GMC (Rearview Camera Supply Circuit)?

- Yes, extreme weather conditions such as heavy rain, snow, or extreme temperatures can potentially damage the rearview camera system components or affect its performance, triggering the code.

9. How often does the OBDII code B399B GMC (Rearview Camera Supply Circuit) occur in vehicles?

- The occurrence of this code can vary among vehicles, but it is not uncommon, especially in vehicles equipped with rearview camera systems that may experience wiring or component issues over time.

10. Are there any recalls related to the OBDII code B399B GMC (Rearview Camera Supply Circuit)?

- It's recommended to check with the manufacturer or authorized dealers for any recalls related to the rearview camera supply circuit issue, as some vehicles may have been subject to recall campaigns addressing this problem.

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